Lieutenant junior grade Walter J. Pierce was a Starfleet engineer. According to medical file M2-013-7, he was born on stardate 15720.4 on the planet Epsilon Indi II. He was the son of Anita R. and Ambrose W. Pierce. He graduated from Starfleet Academy, San Francisco, Earth on stardate 37293.7. In the early 2360s, he was a power systems engineer at the Utopia Planitia Shipyards constructing the Enterprise-D. He served as assistant team leader installing engineering power conduits and the warp engine local control systems.